2161061611 has 2 divisors, whose sum is σ = 2161061612. Its totient is φ = 2161061610.

The previous prime is 2161061603. The next prime is 2161061629. The reversal of 2161061611 is 1161601612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2161061611 - 2³ = 2161061603 is a prime.

It is not a weakly prime, because it can be changed into another prime (2161061681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080530805 + 1080530806.

It is an arithmetic number, because the mean of its divisors is an integer number (1080530806).

Almost surely, 2^2161061611 is an apocalyptic number.

2161061611 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161061611 is an equidigital number, since it uses as much as digits as its factorization.

2161061611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 2161061611 is about 46487.2198674001. The cubic root of 2161061611 is about 1292.8725544787.

The spelling of 2161061611 in words is "two billion, one hundred sixty-one million, sixty-one thousand, six hundred eleven".